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const {set, ifElse, lensIndex, __, curry, update, compose, findIndex, append, equals} = require("ramda")
const S = require('sanctuary')
const isIndex = (i) => i >= 0
const indexOrNothing = ifElse(isIndex, S.Just, S.Nothing)
const findIndexx = curry(compose(indexOrNothing, findIndex))
const replaceIndex = curry((array, replacement, index) => set(lensIndex(index), replacement, array))
const findAndReplace = (findFn, array, replacement) => findIndexx(findFn, array)
.map(replaceIndex(array, replacement))
const addOrReplace = (findFn, array, replacement) => S.maybe(append(replacement, array), update(__, replacement, array), findIndexx(findFn, array))
const input = ['bar', 'baz']
const isBar = equals('bar')
console.log(addOrReplace(equals('bar'), input, 'boo'))
console.log(addOrReplace(equals('baa'), input, 'boo'))
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